Sierra Madre Occidental

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major reference

The largely volcanic
Sierra Madre Occidental, which forms the western border of the Mexican Plateau, has an average elevation of 8,000–9,000 feet (2,400–2,700 metres) and extends roughly 700 miles (1,100 km) from north to south. It has been highly incised by westward-flowing streams that have formed a series of gorges, or barrancas, the most spectacular of which is the complex known...

Sierra Madre

mountain system of Mexico. It consists of the
Sierra Madre Occidental (to the west), the Sierra Madre Oriental (to the east), and the Sierra Madre del Sur (to the south). These ranges enclose the great central Mexican Plateau, which itself is a part of the system—although the northern portion of the plateau also is considered to be part of the Basin and Range Province in the United...

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